How do you set up US Third Party Payments through Payroll?

We're looking into paying garnishments as Third Party Payments through Payroll. We currently have involuntary deduction elements set up with the latest Garnishment architecture. I remember from a very long time ago when we first looked into this setup, that we would end up with one check per garnishee rather than one check per vendor. I'm looking to revisit this with the hopes that at least for our bigger payees (e.g. Child Support) we could end up with a single payment check, or with a NACHA file. Any help or direction would be appreciated.